Smoke cleaner



Dec. 12, 1933. A. c. BENNETT SMOKE CLEANER Original Filed July 24, 1930Fig-4 Invenf'or'. Kshley C. Bennetttier-megs Patented Dec. 12,1933

UNITED STATES PATENT OFFICE SMOKE CLEANER Ashley 0. Bennett,Minneapolis, Minn. OriginaI application July 24, 1930, Serial No.470,390. Divided and this application August 10, 1933. Serial No.684,537

3 Claims. (01. 1s3' 91) My invention relates to smoke cleaners and moreparticularly to means for cleaning particles of solid matter from smokeand furnace gases discharged from chimneys connected with furnaces andhas for its object to remove from furnace gases or smoke, all particlesof solid matter of appreciable weight before the gases escape from thechimney.

A very inexpensive andsatisfactory fuel for making steam for variouspurposes including the heating of buildings is what is known as powderedcoal. Fuel in this condition has advantages not only in regard toeconomy since coal can be used which otherwise is not well adapted forfuel, but also it is an efiective steam making agent producing a veryhot and well-distributed flame. In practice in the burning of powderedcoal, it is blown into the fire chamber under forced draft whichtogether with the natural draft up tall smoke stacks commonly referredto as chimneys produces a very strong movement of the air up the shaftof the chimney. Powdered coal as produced contains a certain percentageof material which does not burn; this material is caught in the strongdraft and carried up and out of the chimney, scattering about.

and collecting on the roofs of buildings and spaces around chimneys.Serious difficulties have been encountered in burning powdered coabecause of these facts.

I have discovered that if the air and exhaust gases going up the chimneyare caused to rotate with a certain degree of velocity and then to bereversed in direction, the particles of solid material carried upward inthe furnace draft will be thrown out of it by the action of centrifugalforce and gravity, with the result that such particles may beaccumulated and carried to a bin and the combustion gases will go out ofthe chimney free from all solid particles excepting those very finecarbon and mineral particles which make light smoke content. A featureof the invention consists in providing a receiving bin or receptaclewhich is normally air tight in order to prevent up-draft in thedischarge stack or tubular member which extends down from the vicinityof the separator into said receptacle.

In practice I may locate the device for whirling and reversing thedirection of the air either outside or inside the chimney, and either ata point near the furnace or at a point near the top of the chimney,depending upon the character of the furnace employed and of the buildingwhere or near where the chimney is located and the heating devicesemployed.

The full objects and advantages of my invention will appear inconnection with the detailed description thereof, and the novel featuresembodied in my inventive idea will be particularly pointed out in theclaims.

In the accompanying drawing which illustrates one of the forms in whichmy invention may be embodied,

Fig. 1 is a vertical sectional view showing the invention. Fig. 2 is aview in horizontal section on the line 2-2 of Fig. 1. horizontal sectionon the line 3-3 of Fig. 1.

Fig. 3 is a view in Fig. 4 is an elevational view of a construction 7similar to that of Fig. 1, but showing it installed in the smoke pipeleading from'the furnace in- 7 stead of being installed in the chimney.

Referring to the drawing, a chimney 12 is shown provided at its upperend with a thimble 14 from whose upper end an annular member 16 extendsoutwardly so as to form the lower member of a casing containing achamber 18 which is closed at the top by a dome member 20, This domemember and the member 16 are connected by tie strips 22., .Above thedome member 20, there is a chamber 24 formed by. a 8. cylindrical innercasing member 26 which exr tends from the periphery of the member 20 upto the periphery of an annular member 28. From the periphery of themember 16, a cylinperiphery of a top member 32 whereby an annularchamber 34 is produced. The members 28 and 32 are cut out centrally toprovide for the passage of a conduit 36 which leads from the dricalouter casing member 30 extends up to the chamber 24 to the outer air.The annular member 26 constitutes a partition between the chambers 24and 34 and around its periphery is provided with a multiplicity of slits38 formed by striking the material downwardly to produce downwardlyinclined deflectors 40. The lower portion of the inner casing member 26is provided with openings 42 which lead into the upper ends of tubularmembers or stacks 44 which are closed at the top except that they havecut out portions to register with the openings 42. The stacks 44 leaddownwardly into normally air tight receiving bins 46 shown in Fig. 4,these stacks being provided with dampers 48. The device shown in Fig. 4is constructed similarly to that shown in Figs. 1, 2 and 3, but insteadof being located at the top of the smoke stack is inserted in thevertical portion of a double curved smoke pipe 50 leading from a furnace52 to the chimney 12. V

The operation and advantages of my invention will be apparent inconnection with the foregoing description and the accompanying drawings.The smoke and furnace gases pass up the chimney 12 or in the form shownin Fig. 4 through a smoke pipe 50 into the chamber 18 from which theypass outwardly into the annular chamber 34. From the latter chamber,they pass downwardly through the slits 38 so that they are not onlyreversed in direction, but I are caused to have a whirling motion by theinclined deflectors 40. As the smoke is rotated in the chamber 24, solidparticles carried by the smoke are thrown outwardly by centrifugal forceand dropped by gravity into the stacks 44. The smoke passes from thechamber 24 out of the conduit 36 into the outside air. The solidparticles drop into the bins 46 from which they may be removed from timeto time. It will be noted from Fig. 1 that the chamber 24 constitutesasettling chamber having a dead air space at its bottom.

x: The. present application is a division of my prior application Ser.No. 470,390, filed July 24,

1930, whichhas matured int-o Patent Number 1,928,808, issued October 3,1933.

I claim:

l. Meansfor. cleaning particles of solid matterriromsmoke and furnacegases discharged from smoke. stacks, comprising an outer casing, aninner'casing spaced within said outer casing and forming upper andlowerchambers therein, said lower chamber having, an inlet opening andbeing econnected peripherally with said upper chamben the lower wall ofsaid upper chamber "being provided with a multiplicity of peripheralslits and associated inclined deflectors, an upwardly extending conduitleading centrally from said inner casing, and downwardly extendingtubular members leading from the periphery of said inner casing.

2. Means for cleaning particles of solid matter from smoke and furnacegases discharged from smoke stacks, comprising an outer casing, an innercasing, spaced within said outer casing and forming upper and lowerchambers therein, said lower chamber having an inlet opening and be- 5%:ing connected peripherally with said upper chamber, the lower wall ofsaid upper chamber being provided with a multiplicity of peripheralslits and associated inclined deflectors, an upwardly extending conduitleading centrally from said inner casing, the bottom wall of said innercasing being dome-shaped, and downwardly extending; tubular membersleading from said inner casing at the periphery of said dome-shapedbottom wall. a

3. Means for cleaning particles of solid matter; from smokeandfurnacegases discharged fromsmoke stacks, comprising an outer casing, an innercasing spaced within said outer casing and forming-upper and lowerchambers therein, Q9. said lower chamber having an inlet opening andbeing connected peripherally with said upper chamber, the lower wall ofsaid upper chamber being provided with a multiplicity of peripheralslits and associated inclined deflectors, an up- 135 wardly extendingconduit leading centrally from said inner casing, downwardly extendingtubular members leading from the periphery of said innercasing, andnormally air tight binslin to l which said downwardly extending tubularmembers discharge.

ASHLEY o. BENNE'rr.

